Southern Hemispheric Westerlies control sedimentary processes of Laguna Azul (south-eastern Patagonia, Argentina)

Journal article


Publication Details

Author(s): Zolitschka B, Fey M, Janssen S, Maidana NI, Mayr C, Wulf S, Haberzettl T, Corbella H, Luecke A, Ohlendorf C, Schaebitz F
Journal: Holocene
Publication year: 2019
Volume: 29
Journal issue: 3
Pages range: 403-420
ISSN: 0959-6836


Abstract

Multiproxy investigations of lacustrine sediments from Laguna Azul (52 degrees S) document multi-millennial Holocene influences of Southern Hemispheric Westerlies (SHW) on the hydroclimatic variability of south-eastern Patagonia. During the last 4000 years, this hydroclimatic variability is overprinted by centennial warm/dry periods. A cool/wet period from 11,600 to 10,100 cal. BP is succeeded by an early Holocene dry period (10,100-8300 cal. BP) with a shallow lake, strong anoxia, methanogenesis and high salinity. Between 8300 and 4000 cal. BP the influence of SHW weakened, resulting in a freshwater lake considered to be related to less arid conditions. Since 4000 cal. BP, regional temperature decreased accompanied by re-intensification of SHW reaching full strength since 3000 cal. BP. Centred around 2200, 1000 cal. BP and in the 20th century, Laguna Azul experienced century-long warm/dry spells. Between these dry periods, two pronounced moist periods are suggested to be contemporaneous to the Dark Age Cold Period' and the Little Ice Age'. Different from millennial SHW variations, centennial fluctuations appear to be synchronous for South America and the Northern Hemisphere. Changes in solar activity, large volcanic eruptions and/or modulations of ocean circulation are potential triggers for this synchronicity.


FAU Authors / FAU Editors

Mayr, Christoph PD Dr.
Institut für Geographie


External institutions with authors

Forschungszentrum Jülich / Research Centre Jülich (FZJ)
Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum - GFZ
Museo Argentino de Ciencias Naturales Bernardino Rivadavia
Universidad de Buenos Aires (UBA) / University of Buenos Aires
Universität Bremen
Universität Greifswald
Universität Köln


How to cite

APA:
Zolitschka, B., Fey, M., Janssen, S., Maidana, N.I., Mayr, C., Wulf, S.,... Schaebitz, F. (2019). Southern Hemispheric Westerlies control sedimentary processes of Laguna Azul (south-eastern Patagonia, Argentina). Holocene, 29(3), 403-420. https://dx.doi.org/10.1177/0959683618816446

MLA:
Zolitschka, Bernd, et al. "Southern Hemispheric Westerlies control sedimentary processes of Laguna Azul (south-eastern Patagonia, Argentina)." Holocene 29.3 (2019): 403-420.

BibTeX: 

Last updated on 2019-08-04 at 09:38